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https://bugzilla.mozilla.org/show_bug.cgi?id=377947
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  <title>Test for Bug 377947</title>
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<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=377947">Mozilla Bug 377947</a>
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<pre id="test">
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/** Test for Bug 377947 **/

/*
 * In particular, test that CSSStyleDeclaration.getPropertyValue doesn't
 * return values for shorthands when some of the subproperties are not
 * specified (a change that wasn't all that related to the main point of
 * the bug).  And also test that the internal system-font property added
 * in bug 377947 doesn't interfere with that.
 */

var s = document.getElementById("display").style;

is(s.getPropertyValue("list-style"), "",
   "list-style shorthand should start off empty");
s.listStyleType="disc";
s.listStyleImage="none";
is(s.getPropertyValue("list-style"), "",
   "list-style shorthand should be empty when some subproperties specified");
s.listStylePosition="inside";
isnot(s.getPropertyValue("list-style"), "",
      "list-style shorthand should produce value when all subproperties set");
s.removeProperty("list-style");
is(s.getPropertyValue("list-style"), "",
   "list-style shorthand be empty after removal");
s.listStyle="none";
isnot(s.getPropertyValue("list-style"), "",
      "list-style shorthand should produce value when shorthand set");
s.removeProperty("list-style");
is(s.getPropertyValue("list-style"), "",
   "list-style shorthand be empty after removal");

is(s.getPropertyValue("font"), "",
   "font shorthand should start off empty");
var all_but_one = {
  "font-family": "serif",
  "font-style": "normal",
  "font-variant": "normal",
  "font-weight": "bold",
  "font-size": "small",
  "font-stretch": "normal",
  "font-size-adjust": "none", // has to be default value
  "font-feature-settings": "normal", // has to be default value
  "font-language-override": "normal", // has to be default value
  "font-kerning": "auto", // has to be default value
  "font-synthesis": "weight style", // has to be default value
  "font-variant-alternates": "normal", // has to be default value
  "font-variant-caps": "normal", // has to be default value
  "font-variant-east-asian": "normal", // has to be default value
  "font-variant-ligatures": "normal", // has to be default value
  "font-variant-numeric": "normal", // has to be default value
  "font-variant-position": "normal" // has to be default value
};

for (var prop in all_but_one) {
  s.setProperty(prop, all_but_one[prop], "");
}
is(s.getPropertyValue("font"), "",
   "font shorthand should be empty when some subproperties specified");
s.setProperty("line-height", "1.5", "");
isnot(s.getPropertyValue("font"), "",
      "font shorthand should produce value when all subproperties set");
s.setProperty("font-size-adjust", "0.5", "");
is(s.getPropertyValue("font"), "",
   "font shorthand should be empty when font-size-adjust is non-default");
s.setProperty("font-size-adjust", "none", "");
isnot(s.getPropertyValue("font"), "",
      "font shorthand should produce value when all subproperties set");
s.removeProperty("font");
is(s.getPropertyValue("font"), "",
   "font shorthand be empty after removal");
s.font="medium serif";
isnot(s.getPropertyValue("font"), "",
      "font shorthand should produce value when shorthand set");
s.removeProperty("font");
is(s.getPropertyValue("font"), "",
   "font shorthand be empty after removal");
s.font="menu";
isnot(s.getPropertyValue("font"), "",
      "font shorthand should produce value when shorthand (system font) set");
s.removeProperty("font");
is(s.getPropertyValue("font"), "",
   "font shorthand be empty after removal");

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